title: Non-random loss of chromosome 3 during transition of Helicobacter pylori-associated gastric MALT to B-cell MALT lymphoma revealed by fluorescence in situ hybridization.
abstract: Acquired gastric mucosa-associated lymphoid tissue (MALT) accumulates as a result of long-standing Helicobacter pylori (H. pylori) infection and from this acquired MALT, low-grade B-cell MALT lymphoma may develop. Carcinogenesis is a multistep, multifactorial process involving the progressive accumulation of genetic changes. To determine whether numerical chromosomal alterations are involved in the transition of H. pylori-associated human gastric MALT to low-grade B-cell MALT lymphoma, frozen biopsy specimens prospectively obtained from H. pylori positive gastric MALT and gastric MALT lymphoma patients, as well as normal control patients (normal gastroscopy/gastric mucosal histology/H. pylori negative), were analyzed by fluorescence in situ hybridization (FISH). Fluorescent, directly labeled alpha-satellite DNA probes, specific for the centromeres of chromosomes 1, 3, 4, 11, 17 and Y were used in this study. The non-random loss of chromosome 3 was detected in two MALT patients and in all five MALT lymphoma patients. Trisomy 17 was detected in one MALT patient and one MALT lymphoma patient. Trisomy 1 was detected in a single MALT lymphoma patient as was trisomy 3. None of the MALT patients had trisomy 3 or trisomy 1. Monosomy 17 was noted in one MALT lymphoma patient. Clonal aneusomy was not observed in any patient for chromosomes Y, 4 or 11. These results suggest that the consistent loss of chromosome 3 may be an important genetic alteration in the transformation of H. pylori-associated gastric MALT into low-grade B-cell gastric MALT lymphoma.
authors.affiliation: Research Division (151), Midwest Biomedical Research Foundation, V.A. Medical Center, Kansas City, MO 64128-2226, USA.
authors.forename: S K
authors.initials: SK
authors.lastname: Banerjee
authors.forename: A P
authors.initials: AP
authors.lastname: Weston
authors.forename: D L
authors.initials: DL
authors.lastname: Persons
authors.forename: D R
authors.initials: DR
authors.lastname: Campbell
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D001706:Biopsy; D002869:Chromosome Aberrations; D002878:Chromosomes, Human, Pair 1; D002880:Chromosomes, Human, Pair 11; D002886:Chromosomes, Human, Pair 17; D002893:Chromosomes, Human, Pair 3; D002894:Chromosomes, Human, Pair 4; D016481:Helicobacter Infections / Q000473:pathology*; D016480:Helicobacter pylori; D006801:Humans; D017404:In Situ Hybridization, Fluorescence; D018442:Lymphoma, B-Cell, Marginal Zone / Q000235:genetics*; D008297:Male; D008875:Middle Aged; D009006:Monosomy; D011230:Precancerous Conditions / Q000235:genetics*; D013270:Stomach / Q000382:microbiology / Q000473:pathology; D014998:Y Chromosome